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Both Nikasil and Gilardoni are trade names.

It's Silicon Carbide disolved in Nickel. It's very durable, except where there is poor quality fuel with excess Sulphur.

There is no oil pressure sensor.

The Dart would originally have had a special sump plug with level sender. You could replace the banjo for the lower oil cooler pipe with one that incorporates a sensor.

I have seen many, many carbs with no O-rings fitted. In fact I'd say most that haven't been rebuilt have had no O-rings.

3/4" or 19mm.

If you want to measure fuel height, modify a spare main jet holder to allow fitting a sight tube.

I'm sure I showed the stand I made in one of my videos. Angle adjustable and allows the cases to be split.

Do NOT ask me to make you one, it's not going to happen.
Do NOT ask for drawings, there never were any.

3potjohn wrote: ↑28 Apr 2021 12:31Even the problem at progression with the existing correct jets was still there.

The needle is parallel until 1/4 throttle, so the main jet circuit has no effect until you reach that point.
The atomiser mostly affects mixture during acceleration.

https://lh3.googleusercontent.com/vQP85k1vQrTW0T3XM3-DP0a0YDMyg9qS_2lkhmjROFQUg1QnleUJT_kANcPSp7o_QSg4u3HYV4xY9IW2ulEpzII6l47q1d6ZNoFx16dkln2P4SgC2uC_uEe35hxfkcfEQdhyCF3mFPtrO5mI62ACCrKhJHnfGQmvuLje2BDK6C0S06qYbWeXRdC1_mRkISrKoay55_ZvBncCxD3_GJUnbivN_hvUbMjha4172_Anz-9OFEhLwPRxlV1lFc1q8DkkaM93wHkrQ...

14 tooth is standard on Morinis with 500 series chain.

Have you checked whether your rear sprocket is standard?

I don't use a Colortune on a motorcycle. The volume of them is too big compared to the cylinder and leads to misleading readings. There are motorcycle versions with reduced volume. The idle mixture atomisation of the Delorto is also quite crude and give a misleading colour. Very slowly turn in the m...

White sleeve is for push on applications (like the early metal inlet manifolds).
Black inner smooths transition from carb to rubber inlet manifold.

It's not going to help with air leaks. The black adapter isn't available from Eurocarb, so I'd make a one piece insert that does both jobs.

Understood, but with that said at the most basic level, when built up, should the slides in the carbs fully close down? Mine are visibly still open at the bottom. Yes, there should be a slight gap under the slide. Also the manuals always stated that the 350 S needed the 260 BD atomiser but my carbs...

When I'm rebuilding carbs and presetting them off the bike, I'll set the stop screw to barely create a gap under the slide. If the ignition is too advanced, the idle speed can be right, or even too fast with the slides fully shut. On the other hand if retarded, the slides may end up too far open to ...

Make sure the throttle cable has slack.